It's safe to say that Ian Somerhalder is a man in love.

The 35-year-old "Vampire Diaries" star took to Instagram to share a picture of him and "Twilight" actress Nikki Reed spending time together with their two dogs.

Somerhalder accompanied the sweet snapshot with a lengthy caption, where the actor confessed his love for his girlfriend of nearly four months and also promoted Reed's charity work at the American Society for the Prevention of Cruelty to Animals.

"A day with 3 of the most beautiful ladies in the universe ... Wow smiling is such a beautiful part of the human experience - I highly recommend it," he wrote. "Congrats to our little Neitczhe here - 1 year ago today, to the minute, you brought 5 beautiful puppies into this world - thank you for your amazing contribution to all of our lives.

"However, welcome to the wonderful world of being spayed, the world does not need any more puppies, we kill millions and millions per year," he added. "These two beautiful creatures right here in this photo or highly intelligent, highly emotional and capable of more love than you can you can ever imagine."

Reed owns two horses, two German shepherds and five dogs. The 26-year-old built a guesthouse on her property to help house foster animals.

He concluded, "The ones that are in shelters are the same - let's adopt them. @iamnikkireed your recent work with Gilt benefiting the @aspca is truly truky extraordinary. Thank you for giving so much of your life and for being a strong voice for those whom can speak. My hat is off to you. You amaze me. Love, Ian."

The couple, who were first spotted together in July has reportedly become very serious, even moving in together in Atlanta, Ga., where Somerhalder is filming season six of  "Vampire Diaries." A source told E! News that Somerhalder and Reed are "having a great time with one another. They are still crazy for each other."

Wedding bells anyone?